/**
 * Copyright ${license.git.copyrightYears} the original author or authors.
 * <p>
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.ibatis.executor.resultset;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.mockito.Mockito.when;

import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Statement;
import java.sql.Types;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.ibatis.builder.StaticSqlSource;
import org.apache.ibatis.executor.Executor;
import org.apache.ibatis.executor.parameter.ParameterHandler;
import org.apache.ibatis.mapping.BoundSql;
import org.apache.ibatis.mapping.MappedStatement;
import org.apache.ibatis.mapping.ResultMap;
import org.apache.ibatis.mapping.ResultMapping;
import org.apache.ibatis.mapping.SqlCommandType;
import org.apache.ibatis.session.Configuration;
import org.apache.ibatis.session.ResultHandler;
import org.apache.ibatis.session.RowBounds;
import org.apache.ibatis.type.TypeHandlerRegistry;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.mockito.Mock;
import org.mockito.Spy;
import org.mockito.junit.jupiter.MockitoExtension;

@ExtendWith(MockitoExtension.class)
class DefaultResultSetHandlerTest2 {

    @Spy
    private ImpatientResultSet rs;
    @Mock
    private Statement stmt;
    @Mock
    protected ResultSetMetaData rsmd;
    @Mock
    private Connection conn;
    @Mock
    private DatabaseMetaData dbmd;

    @SuppressWarnings("serial")
    @Test
    void shouldNotCallNextOnClosedResultSet_SimpleResult() throws Exception {
        final Configuration config = new Configuration();
        final TypeHandlerRegistry registry = config.getTypeHandlerRegistry();
        final MappedStatement ms = new MappedStatement.Builder(config, "testSelect",
                new StaticSqlSource(config, "some select statement"), SqlCommandType.SELECT).resultMaps(
                new ArrayList<ResultMap>() {
                    {
                        add(new ResultMap.Builder(config, "testMap", HashMap.class, new ArrayList<ResultMapping>() {
                            {
                                add(new ResultMapping.Builder(config, "id", "id", registry.getTypeHandler(Integer.class)).build());
                            }
                        }).build());
                    }
                }).build();

        final Executor executor = null;
        final ParameterHandler parameterHandler = null;
        final ResultHandler<?> resultHandler = null;
        final BoundSql boundSql = null;
        final RowBounds rowBounds = new RowBounds(5, 1);
        final DefaultResultSetHandler resultSetHandler = new DefaultResultSetHandler(executor, ms, parameterHandler,
                resultHandler, boundSql, rowBounds);

        when(stmt.getResultSet()).thenReturn(rs);
        when(rsmd.getColumnCount()).thenReturn(1);
        when(rsmd.getColumnLabel(1)).thenReturn("id");
        when(rsmd.getColumnType(1)).thenReturn(Types.INTEGER);
        when(rsmd.getColumnClassName(1)).thenReturn(Integer.class.getCanonicalName());
        when(stmt.getConnection()).thenReturn(conn);
        when(conn.getMetaData()).thenReturn(dbmd);
        when(dbmd.supportsMultipleResultSets()).thenReturn(false); // for simplicity.

        final List<Object> results = resultSetHandler.handleResultSets(stmt);
        assertEquals(0, results.size());
    }

    @SuppressWarnings("serial")
    @Test
    void shouldNotCallNextOnClosedResultSet_NestedResult() throws Exception {
        final Configuration config = new Configuration();
        final TypeHandlerRegistry registry = config.getTypeHandlerRegistry();
        final ResultMap nestedResultMap = new ResultMap.Builder(config, "roleMap", HashMap.class,
                new ArrayList<ResultMapping>() {
                    {
                        add(new ResultMapping.Builder(config, "role", "role", registry.getTypeHandler(String.class))
                                .build());
                    }
                }).build();
        config.addResultMap(nestedResultMap);
        final MappedStatement ms = new MappedStatement.Builder(config, "selectPerson",
                new StaticSqlSource(config, "select person..."),
                SqlCommandType.SELECT).resultMaps(
                        new ArrayList<ResultMap>() {
                            {
                                add(new ResultMap.Builder(config, "personMap", HashMap.class, new ArrayList<ResultMapping>() {
                                    {
                                        add(new ResultMapping.Builder(config, "id", "id", registry.getTypeHandler(Integer.class))
                                                .build());
                                        add(new ResultMapping.Builder(config, "roles").nestedResultMapId("roleMap").build());
                                    }
                                }).build());
                            }
                        })
                .resultOrdered(true)
                .build();

        final Executor executor = null;
        final ParameterHandler parameterHandler = null;
        final ResultHandler<?> resultHandler = null;
        final BoundSql boundSql = null;
        final RowBounds rowBounds = new RowBounds(5, 1);
        final DefaultResultSetHandler resultSetHandler = new DefaultResultSetHandler(executor, ms, parameterHandler,
                resultHandler, boundSql, rowBounds);

        when(stmt.getResultSet()).thenReturn(rs);
        when(rsmd.getColumnCount()).thenReturn(2);
        when(rsmd.getColumnLabel(1)).thenReturn("id");
        when(rsmd.getColumnType(1)).thenReturn(Types.INTEGER);
        when(rsmd.getColumnClassName(1)).thenReturn(Integer.class.getCanonicalName());

        final List<Object> results = resultSetHandler.handleResultSets(stmt);
        assertEquals(0, results.size());
    }

    /*
     * Simulate a driver that closes ResultSet automatically when next() returns false (e.g. DB2).
     */
    protected abstract class ImpatientResultSet implements ResultSet {
        private int rowIndex = -1;
        private List<Map<String, Object>> rows = new ArrayList<>();

        protected ImpatientResultSet() {
            Map<String, Object> row = new HashMap<>();
            row.put("id", 1);
            row.put("role", "CEO");
            rows.add(row);
        }

        @Override
        public boolean next() throws SQLException {
            throwIfClosed();
            return ++rowIndex < rows.size();
        }

        @Override
        public boolean isClosed() {
            return rowIndex >= rows.size();
        }

        @Override
        public String getString(String columnLabel) throws SQLException {
            throwIfClosed();
            return (String) rows.get(rowIndex).get(columnLabel);
        }

        @Override
        public int getInt(String columnLabel) throws SQLException {
            throwIfClosed();
            return (Integer) rows.get(rowIndex).get(columnLabel);
        }

        @Override
        public boolean wasNull() throws SQLException {
            throwIfClosed();
            return false;
        }

        @Override
        public ResultSetMetaData getMetaData() {
            return rsmd;
        }

        @Override
        public int getType() throws SQLException {
            throwIfClosed();
            return ResultSet.TYPE_FORWARD_ONLY;
        }

        private void throwIfClosed() throws SQLException {
            if (rowIndex >= rows.size()) {
                throw new SQLException("Invalid operation: result set is closed.");
            }
        }
    }
}
